US1978907A - Illuminating unit - Google Patents

Description

Oct. 30, 1934. Y I A. F. MARTIN 1,978,907

ILLUMINATING UNIT Filed D60. 24, 1952 2 Sheets-Sheet l 20' v 25 g f 26; 26 H 22 22 IO FIG. 30

ALLAN F. MARTIN 22 INVENTOR BY m ATTORNEY Oct. 30, 1934. MARTlN 1,978,907

ILLUMINATING UNIT Filed Dec. 24, 1932 2 Sheets-Sheet 2 FIG. 4

ALLAN F. MARTIN INVENTOR ATTORNEY Patented Oct. 30, 1934 UNITED STATES PATENT OFFICE ILLUMINATING UNIT Allan F. Martin, Rochester,- N. Y., assignor to Bausch & Lomb Optical Company, Rochester, N. Y., a corporation of New York Application December 24, 1932, Serial No. 648,783

2 Claims. (Cl. Will-1.4)

that the operation can be completed without interruptions which often result in serious consequences. At the present time practically all surgical operations are performed under artificial illumination since it can be readily controlled and directed and is of uniform quality '15 irrespective of the prevailing weather conditions or time of the day or year. In spite of the present day efficiency of artificial electrical illuminating units, it is possible that the incandescent lamp will burnout during the progress of an operation. 20

It then becomes necessary to insert a new lamp as quickly as possible.

One of the objects of my invention is to provide an illuminating device having means wherei by the light source may be readily replaced with 25 a minimum of time and efiort. Another object is to provide an illuminating unit having a plurality of lamps which can be selectively placed in operative position. A further object is to pro- Vide a device of the type described having a plu- 30 rality of lamps each mounted on a movable bracket whereby any one of the lamps can be quickly placed in operative position. Other objects and advantages reside in certain novel features of construction, arrangement and combination of parts as will hereinafter be more fully described and pointed out in the appended claims.

Referring to the drawings:

Fig. 1 is a side elevation of an illuminating device embodying my invention.

Fig. 2 is a top plan view of same with parts broken away.

Fig. 3 is a vertical sectional view of same showing the relation of the optical elements.

Fig. 4 is an enlarged fragmentary view showing the lamp mountings.

A preferred embodiment of my invention is disclosed in the drawings wherein 10 indicates a circular casing having a top 11 and a bottom 12. Mounted at the central part of the casing is a housing 13 which carries the condensing lenses liarranged in a ring-like formation. Mounted on the bottom 12 of the casing are the two bearing posts 15 and 15' which are positioned, respectively, on opposite sides of the housing 13 while the bearing posts 16 and 16' are mounted adjacent to the edge of the bottom member 12.

Rotatably mounted in these two pairs of bearing posts are the shafts 17 and 17' to which are respectively secured the two brackets 18 and 18 having the cam portions 19 and 19 and the upwardly extending arms 20 and 20, respectively.

Mounted, respectively, on brackets 18 and 18' are the two incandescent lamps 21 and 21'. Shafts 17 and 17 are provided, respectively, with hand knobs 22 and 22 which are positioned exteriorly of the casing. The brackets 18 and 18 extend through slots 23 and 23 in the housing 13. It will thus be apparent that either bracket 18 or 18' can be swung into or out of position so as to selectively locate either lamp 21 or 21' in operative position so that it will send li ht rays through the lenses 14. The upwardly extending arms 20 and 20' on the two brackets prevent the accidental breaking of a lamp by the bracket. prevents bracket 18 from striking lamp 21 when it is operatively positioned. Lamp 21 must first be swung up out of position before lamp 21 can be placed in operative position. Leaf springs 24 and 24. contact with the cam portions 19 and 19 on the brackets and so prevent the sudden dropping of either lamp as it is brought into position.

Electrical energy is supplied from a suitable source by a conductor 25 leading to the switches 26 and 26' from whence the conductors 27 and 27 lead to the lamps 21 and 21', respectively. Each of the switches controls one lamp so that the lamps can be independently operated. As shown in Fig. 3, each of the lenses 14 cooperates with a lens 28 and an inclined reflector 29 positioned in spaced relation around the periphery of the bottom member 12. Light rays from the lamp will thus pass through the lenses 14 and Z8 and be reflected downwardly and inwardly by reflector 29, the light rays passing through a glass plate 30 which covers an opening in the casing member 12. Light rays from the lamp pass through the various lenses and strike the cooperating reflectors so that a series of beams are directed inwardly and downwardly to a common area to illuminate the field of operation in a manner disclosed in U. S. Patent No. 1,277,109 issued to W. L. Patterson on August 27, 1918.

From the foregoing, it will be apparent that I am able to attain the objects of my invention and provide an illuminating device having means whereby the light source may be readily replaced or renewed with a minimum of time and effort.

In case a lamp burns out during an operation, it

Thus, as shown in Fig. 4, arm 20 is only necessary to swing that lamp up out of the way, swing the new lamp into position and operate the switch to energize the lamp. This change can, obviously, be carried out quickly and. easily and it is not necessary to take off any covers or open up the casing. Nor is it necessary to touch a lamp which is probably too hot to handle' The upwardly extending arm on each bracket prevents the operator from accidentally moving one lamp into contact with the other. Various modifications can obviously be made without departing from the spirit of my invention.

I claim:

1. An illuminatingdevice of the character described comprising a casing, optical elements circularly arranged around the periphery of said casing, two posts mounted near the central part of said casing, a bracket pivoted on a horizontal axis on each of said posts, a light source carried by each of said brackets, a rotatable shaft conjnectedto eachof said brackets, said shafts extending exteriorly of said casing whereby said light sources may be independently and selectively positioned so as to direct light rays onto said elements.

2. An illuminating device of the character described comprising a substantially circular casing, optical elements arranged around the periphery of said casing, two spaced posts mounted near the central part of said casing, a bracket pivotally mounted on each post, a light source carried by each bracket, a rotatable shaft secured to each bracket, said shafts extending exteriorly of the casing whereby said light sources may be independently and selectively swung into operative position to direct light rays onto said elements, each of said brackets having an upwardly extending arm with the arms and brackets lying substantially in the same plane whereby the bracket not in operative position will be prevented from striking the light source in operative position. t 1

ALLAN F. MARTIN.

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